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ACQUISITIONS (Grand River Gathering) (Details) (USD $)
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12 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Oct. 27, 2011
Grand River Gathering, LLC
hp
mi
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Dec. 31, 2011
Grand River Gathering, LLC
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Oct. 27, 2011
Minimum
Grand River Gathering, LLC
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Oct. 27, 2011
Maximum
Grand River Gathering, LLC
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Oct. 27, 2011
Weighted Average
Grand River Gathering, LLC
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Oct. 27, 2011
Sponsors
Grand River Gathering, LLC
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Oct. 27, 2011
Gas gathering agreement contract intangibles
Grand River Gathering, LLC
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Oct. 27, 2011
Rights-of-way
Grand River Gathering, LLC
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Jun. 30, 2012
Purchase Price Allocation Adjustments
Grand River Gathering, LLC
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Jun. 30, 2012
Construction in progress
Purchase Price Allocation Adjustments
Grand River Gathering, LLC
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| Business Acquisition [Line Items] | |||||||||||||
| Useful lives | 10 years | 25 years | 12 years 9 months | ||||||||||
| Length of pipeline acquired (in miles) | 260 | ||||||||||||
| Capacity of compression facilities acquired (in horsepower) | 90,000 | ||||||||||||
| Equity contribution | $ 0 | $ 0 | $ 425,000,000 | $ 410,000,000 | |||||||||
| Proceeds from promissory notes | 200,000,000 | ||||||||||||
| Nonrecurring transaction costs | 3,200,000 | ||||||||||||
| Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] | |||||||||||||
| Purchase price | 590,210,000 | ||||||||||||
| Property, plant, and equipment | 295,240,000 | (4,700,000) | |||||||||||
| Intangible assets | 244,100,000 | 8,016,000 | (37,900,000) | ||||||||||
| Total assets acquired | 547,356,000 | ||||||||||||
| Deferred revenue | 1,770,000 | ||||||||||||
| Other current liabilities | 854,000 | ||||||||||||
| Total liabilities assumed | 2,624,000 | ||||||||||||
| Net identifiable assets acquired | 544,732,000 | ||||||||||||
| Goodwill | $ 115,888,000 | $ 45,478,000 | $ 45,478,000 | $ 45,478,000 | $ 45,500,000 | ||||||||